JP2019138256A - Cooling device - Google Patents

Abstract

To provide a cooling device capable of suppressing deformation of a bottom portion of a case body having a thin thickness even when an annular seal member for preventing leakage of a cooling medium is disposed between the bottom portion of the case body of a bottomed and cylindrical centrifugal pump and a side face of a radiator, in the cooling device including the centrifugal pump directly mounted on a side face of the radiator.SOLUTION: In a cooling device, an annular seal member 38 for preventing leakage of a cooling medium from a part between a centrifugal pump 6 and a tank chamber 11, is disposed between a bottom portion 23d of a case body 23 of the bottomed cylindrical centrifugal pump 6 having a cylindrical portion 23c and the bottom portion 23d, and the tank chamber 11 of the radiator 4. Further in the cooling device, an inner peripheral face 23r of the cylindrical portion 23c connected to a face at a X2 direction side of the bottom portion 23d and the seal member 38 are overlapped when observed from an axial direction of a rotation center axis 30 of a motor 15.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a cooling device for cooling a heat generating component such as an electronic component.

  Conventionally, a cooling device (cooling system) for cooling a CPU (Central Processing Unit) is known (for example, see Patent Document 1). The cooling device described in Patent Document 1 includes a heat receiving jacket in which a CPU is mounted and a cooling medium passes through the inside, a radiator unit for cooling the cooling medium heated by the heat receiving jacket, a heat receiving jacket and a radiator unit, And two circulation pumps for circulating the cooling medium between them. Two circulation pumps are connected in series via a tube. One of the two circulation pumps and the radiator section are connected via a tube, and the other circulation pump and the heat receiving jacket are connected via a tube. Moreover, the heat receiving jacket and the radiator are connected via a tube.

  Conventionally, a centrifugal pump (pump device) including a motor having a rotor and a stator and an impeller fixed to the rotor is known (see, for example, Patent Document 2). The outline of the centrifugal pump described in Patent Document 2 is formed of a bottomed cylindrical shape and a housing that covers the stator and a case body that covers the opening side of the housing. A pump chamber through which fluid passes is formed between the housing and the case body.

  Moreover, in the centrifugal pump described in Patent Document 2, the motor includes a fixed shaft that rotatably supports the rotor. One end of the fixed shaft is held by the case body, and the other end of the fixed shaft is held by the housing. Thrust bearings that support the rotor in the axial direction of the fixed shaft are attached to both ends of the fixed shaft. A sleeve constituting a part of the rotor is disposed between the two thrust bearings. A gap (thrust backlash) is formed between at least one of the two thrust bearings and the sleeve.

  Moreover, in the centrifugal pump described in Patent Document 2, the case body is formed in a bottomed cylindrical shape that opens on the housing side, and includes a cylindrical portion formed in a cylindrical shape and a bottom portion that closes one end of the cylindrical portion. I have. The case body is formed with an inlet port through which fluid flows and an outlet port through which the fluid is discharged. The tip of the introduction port portion is a fluid suction port. The introduction port portion is disposed at the center of the bottom portion. The introduction port is arranged coaxially with the fixed shaft. Further, the case body is formed with a shaft holding portion for holding one end portion of the fixed shaft. The shaft holding portion is formed integrally with the bottom portion and is connected to the center portion of the bottom portion.

JP 2005-228237 A JP 2010-7642 A

  The inventor of the present application is considering fixing a centrifugal pump directly to a side surface of a radiator in a cooling device for cooling a heat generating component such as a CPU. Specifically, it is considered that the centrifugal pump is directly fixed to the side surface of the radiator so that the suction port of the centrifugal pump faces the radiator side. Further, the inventor of the present application, for example, a centrifugal pump including a case body formed with a bottomed cylindrical shape and having a suction port and a discharge port as in the centrifugal pump described in Patent Document 2. We are considering fixing it to the side.

  In addition, the inventor of the present application is considering thinning the centrifugal pump in the axial direction of the fixed shaft in order to suppress the protruding amount of the centrifugal pump from the side surface of the radiator, and reducing the bottom of the case body. Are considering. Furthermore, in order to prevent leakage of the cooling medium from between the radiator and the centrifugal pump, the inventor of the present application provides an O-ring or the like between the bottom of the centrifugal pump case body in which the suction port is formed and the side surface of the radiator. The arrangement of an annular seal member is under consideration.

  However, according to the study of the present inventor, when the seal member is disposed between the bottom portion of the thin case body and the side surface of the radiator, the reaction force of the seal member is crushed between the bottom portion of the case body and the side surface of the radiator. It became clear that there is a possibility that the bottom may be deformed toward the inside of the centrifugal pump. In addition, when the bottom portion is deformed toward the inside of the centrifugal pump, the shaft holding portion formed integrally with the bottom portion is displaced to the inside of the centrifugal pump, and there is no thrust play between the sleeve and the thrust bearing. It became clear by examination of this inventor that there exists a possibility that an impeller may stop rotating.

  Accordingly, an object of the present invention is to provide a cooling device including a centrifugal pump that is directly attached to a side surface of a radiator, and a cooling medium between a bottom portion of a centrifugal pump case body formed in a bottomed cylindrical shape and a side surface of the radiator. An object of the present invention is to provide a cooling device capable of suppressing deformation of the bottom portion of a case body having a small thickness even when an annular seal member for preventing leakage is disposed.

  In order to solve the above problems, a cooling device of the present invention is mounted on a heat generating component and cools a cooling body through which a cooling medium that is a cooling liquid passes, and a cooling medium heated by the cooling body. The radiator, and a centrifugal pump for circulating the cooling medium between the cooling body and the radiator. The radiator is for a plurality of cooling pipes through which the cooling medium passes and a plurality of heat radiations connected to the outer peripheral surface of the cooling pipe. The centrifugal pump includes a motor having a rotor and a stator, an impeller fixed to the rotor and rotated by the power of the motor, and a cooling medium suction port. And a case body in which the discharge port is formed. The motor includes a rotation center shaft serving as a rotation center of the rotor and the impeller, and one of the axial directions of the rotation center shaft is defined as a first direction, Assuming that the opposite direction is the second direction, the case body is formed in a bottomed cylindrical shape having a cylindrical portion formed in a cylindrical shape and a bottom portion that closes one end of the cylindrical portion. The axial direction coincides with the axial direction of the rotation center axis, the bottom portion closes the first direction end of the cylinder portion, and the case body has an axis holding portion that holds the end portion of the rotation center axis in the first direction. A through hole is formed in the center of the bottom portion in the axial direction of the rotation center axis and through which the cooling medium sucked from the suction port passes, and the shaft holding portion is located on the second direction side of the bottom portion. The centrifugal pump is fixed to the tank chamber with the bottom surface, which is the surface on the first direction side of the bottom portion, facing the side surface on the second direction side of the tank chamber, and is connected to the center portion of the bottom portion. Between the bottom of the tank and the side of the tank chamber, leakage of cooling medium from between the centrifugal pump and the tank chamber An annular sealing member for preventing is disposed so as to surround the through hole, and when viewed from the axial direction of the rotation center axis, the inner peripheral surface of the cylindrical portion connected to the surface on the second direction side of the bottom portion and the sealing member Is characterized by overlapping.

  In the cooling device of the present invention, the centrifugal pump and the tank chamber are disposed between the bottom surface of the bottom portion of the centrifugal pump case body formed in a bottomed cylindrical shape and the side surface of the tank chamber of the radiator (that is, the side surface of the radiator). An annular sealing member for preventing leakage of the cooling medium from between the two is disposed. Moreover, in this invention, when it sees from the axial direction of a rotation center axis | shaft, the internal peripheral surface of the cylinder part connected with the surface of the 2nd direction side of the bottom part of a case body and the cyclic | annular seal member have overlapped.

  Therefore, in the present invention, at least a part of the reaction force of the seal member that is crushed between the bottom surface of the bottom portion of the case body and the side surface of the tank chamber can be received by the cylindrical portion of the case body. Therefore, in the present invention, even if the seal member is disposed between the bottom portion of the case body and the side surface of the radiator, the deformation of the bottom portion of the case body having a reduced thickness (specifically, in the second direction). It is possible to suppress the deformation of the bottom part).

  Further, in the present invention, it becomes possible to suppress the deformation of the bottom portion of the case body in the second direction. Therefore, even if the seal member is disposed between the bottom portion of the case body and the side surface of the radiator, It is possible to suppress the shift amount of the shaft holding portion connected to the center portion in the second direction. Therefore, in the present invention, even if the seal member is disposed between the bottom of the case body and the side surface of the radiator, it is possible to suppress the amount of reduction in the thrust backlash of the rotor and the impeller. The phenomenon that the impeller stops rotating is less likely to occur.

  Further, in the present invention, it is possible to reduce the thickness of the bottom portion while suppressing deformation of the bottom portion of the case body, so that the centrifugal pump can be downsized in the axial direction of the rotation center axis. Therefore, in this invention, it becomes possible to suppress the protrusion amount of the centrifugal pump from the side surface of a radiator.

  In the present invention, for example, the rotation center shaft is a fixed shaft that rotatably supports the rotor and the impeller, and the impeller is formed with a bearing portion through which the rotation center shaft is inserted, and the axial direction of the rotation center shaft A thrust bearing is disposed between the bearing portion and the shaft holding portion. In this case, it is possible to suppress the reduction amount of the thrust backlash between the bearing portion of the impeller and the thrust bearing.

  In the present invention, the seal member is, for example, an O-ring. In this case, it is easy to ensure the adhesion between the bottom surface of the bottom portion of the case body and the sealing member and the adhesion between the side surface of the tank chamber and the sealing member over the entire circumference of the sealing member. Therefore, it becomes easy to prevent leakage of the cooling medium from between the centrifugal pump and the tank chamber over the entire circumference of the seal member.

  In the present invention, at the boundary between the second direction side surface of the bottom portion and the inner peripheral surface of the cylindrical portion, there is a curved surface portion made of a concave curved surface that connects the second direction side surface of the bottom portion and the inner peripheral surface of the cylindrical portion. The contact portion formed and viewed from the axial direction of the center axis of rotation is in contact with the bottom surface of the bottom portion and the O-ring on the radially outer side of the cylindrical portion with respect to the inner end of the curved surface portion in the radial direction of the cylindrical portion. It is preferable that they are arranged. If comprised in this way, it will become possible to receive more reaction force of the sealing member crushed between the bottom face of the bottom part of a case body, and the side surface of a tank chamber in the cylinder part of a case body. Accordingly, it is possible to effectively suppress deformation of the bottom portion of the case body having a small thickness.

  In the present invention, when viewed from the axial direction of the rotation center axis, it is preferable that the contact portion where the bottom surface of the bottom portion and the O-ring come into contact with the inner peripheral surface of the cylindrical portion overlap. If comprised in this way, it will become possible to receive more reaction force of the sealing member crushed between the bottom face of the bottom part of a case body, and the side surface of a tank chamber in the cylinder part of a case body. Accordingly, it is possible to effectively suppress deformation of the bottom portion of the case body having a small thickness.

  In the present invention, when viewed from the axial direction of the rotation center axis, the contact portion where the bottom surface of the bottom portion and the O-ring are in contact is disposed outside the inner peripheral surface of the cylindrical portion in the radial direction of the cylindrical portion. It is preferable. If comprised in this way, it will become possible to receive all the reaction force of the sealing member crushed between the bottom face of the bottom part of a case body, and the side surface of a tank chamber by the cylinder part of a case body. Therefore, it becomes possible to more effectively suppress the deformation of the bottom portion of the case body having a small thickness.

  In the present invention, an adhesive for preventing leakage of the cooling medium from between the centrifugal pump and the tank chamber is applied between the bottom surface of the bottom portion and the side surface of the tank chamber on the inner peripheral side of the seal member. It is preferable. If comprised in this way, it will become possible to prevent effectively the leakage of the cooling medium from between a centrifugal pump and a tank chamber.

  In the present invention, the radiator is formed in an elongated rectangular parallelepiped, and is arranged so that the longitudinal direction of the radiator coincides with the horizontal direction. The tank chamber constitutes one end of the radiator in the longitudinal direction of the radiator, and the centrifugal pump Is fixed to one end of the radiator in the longitudinal direction of the radiator, and the centrifugal pump is formed with a pump chamber through which the cooling medium sucked from the suction port passes toward the discharge port, and the outlet of the cooling medium in the pump chamber is It is preferable that it is disposed above the suction port. When the centrifugal pump is stopped, the air in the pump chamber accumulates in the upper part of the pump chamber. With this configuration, the air in the pump chamber is discharged outside the pump chamber when the centrifugal pump is started. It becomes easy to do. Therefore, by repeatedly starting and stopping the centrifugal pump, the air in the pump chamber can be easily removed.

  In the present invention, the radiator is formed in an elongated rectangular parallelepiped, and is arranged so that the longitudinal direction of the radiator coincides with the horizontal direction. The tank chamber constitutes one end of the radiator in the longitudinal direction of the radiator, and the centrifugal pump Is fixed to one end of the radiator in the longitudinal direction of the radiator, and one end side of the pipe disposed inside the tank chamber is connected to the suction port forming portion of the centrifugal pump in which the suction port is formed, and the other end of the pipe Is preferably arranged on the lower end side inside the tank chamber. If comprised in this way, even if air exists in the upper part in a tank chamber, it will become possible to prevent that a centrifugal pump inhales the air in a tank chamber.

  As described above, according to the present invention, in the cooling device including the centrifugal pump directly attached to the side surface of the radiator, the cooling medium is provided between the bottom portion of the case body of the centrifugal pump formed in a bottomed cylindrical shape and the side surface of the radiator. Even if an annular seal member for preventing leakage of the case is disposed, it is possible to suppress deformation of the bottom portion of the case body having a small thickness.

It is the schematic for demonstrating the structure of the cooling device concerning embodiment of this invention. It is the schematic for demonstrating the structure of the radiator shown in FIG. It is sectional drawing for demonstrating the installation direction of the centrifugal pump shown in FIG. It is sectional drawing for demonstrating the structure of the centrifugal pump shown in FIG. 1, and the structure of the connection part of a centrifugal pump and a tank chamber. It is a perspective view of the case body shown in FIG. It is a figure for demonstrating the structure of the connection part of the centrifugal pump and tank chamber concerning other embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Configuration of cooling device)
FIG. 1 is a schematic diagram for explaining a configuration of a cooling device 1 according to an embodiment of the present invention. FIG. 2 is a schematic diagram for explaining the configuration of the radiator 4 shown in FIG. FIG. 3 is a cross-sectional view for explaining the installation direction of the centrifugal pump 6 shown in FIG. FIG. 4 is a cross-sectional view for explaining the configuration of the centrifugal pump 6 shown in FIG. 1 and the configuration of the connecting portion between the centrifugal pump 6 and the tank chamber 11. FIG. 5 is a perspective view of the case body 23 shown in FIG. In FIG. 4, a cross section corresponding to the EE cross section of FIG. 3 is shown.

  The cooling device 1 of this embodiment is a device for cooling the heat generating component 2. Specifically, the cooling device 1 is a device for cooling the two heat generating components 2. The heat generating component 2 of this embodiment is an electronic component. Specifically, one of the two heat generating components 2 is a CPU, and the other heat generating component 2 is a GPU (Graphics Processing Unit). The cooling device 1 of this embodiment is used by being attached to a server. The cooling device 1 may be used by being attached to a personal computer.

  The cooling device 1 is attached to the heat generating component 2 and has two cooling bodies 3 through which a cooling medium that is a cooling liquid passes, and a radiator 4 for cooling the cooling medium heated by the cooling body 3. A plurality of cooling fans 5 attached to the radiator 4 and a centrifugal pump 6 for circulating a cooling medium between the cooling body 3 and the radiator 4 are provided. The cooling medium is, for example, cooling water. However, the cooling medium may be a liquid other than the cooling water.

  The cooling body 3 is a cooling plate formed in a flat plate shape. One surface of the cooling body 3 formed in a flat plate shape is in contact with the heat generating component 2. A flow path through which the cooling medium passes is formed inside the cooling body 3. The two cooling bodies 3 are connected in series with respect to the radiator 4. Specifically, the two cooling bodies 3 are connected in series via a pipe 8 made of a resin tube or the like.

  The radiator 4 is formed in an elongated rectangular parallelepiped shape. The radiator 4 is disposed so that the longitudinal direction of the radiator 4 and the horizontal direction coincide with each other. That is, the longitudinal direction of the radiator 4 coincides with the horizontal direction. The radiator 4 includes a plurality of cooling pipes 9 through which a cooling medium passes, a plurality of heat radiation fins 10 connected to the outer peripheral surface of the cooling pipe 9, a tank chamber 11 to which one end portions of the plurality of cooling pipes 9 are connected, and a plurality of And a tank chamber 12 to which the other end of the cooling pipe 9 is connected.

  In the following description, the longitudinal direction of the radiator 4 (X direction in FIG. 1 and the like) is referred to as “left-right direction”. Further, one of the left and right directions (X1 direction in FIG. 1 and the like) is referred to as “right direction”, and the opposite direction X2 direction in FIG. 1 and the like is referred to as “left direction”. In this embodiment, the left ends of the plurality of cooling pipes 9 are connected to the tank chamber 11, and the right ends of the plurality of cooling pipes 9 are connected to the tank chamber 12.

  The radiator 4 in this embodiment includes, for example, three cooling pipes 9. The cooling pipe 9 is formed in a long and narrow linear shape. The longitudinal direction of the cooling pipe 9 coincides with the left-right direction (that is, the longitudinal direction of the radiator 4). The cross-sectional shape of the cooling pipe 9 is a flat oval shape. The tank chamber 11 constitutes one end of the radiator 4 in the longitudinal direction of the radiator 4, and the tank chamber 12 constitutes the other end of the radiator 4 in the longitudinal direction of the radiator 4. That is, the tank chamber 11 constitutes the left end portion of the radiator 4, and the tank chamber 12 constitutes the right end portion of the radiator 4.

  The tank chambers 11 and 12 are formed in a hollow shape. The inner peripheral side of the cooling pipe 9 communicates with the inside of the tank chambers 11 and 12. The cooling medium before passing through the cooling pipe 9 is accumulated in the tank chamber 12. Further, the cooling medium after passing through the cooling pipe 9 is accumulated in the tank chamber 11. The plurality of fans 5 are fixed to the radiator 4 and blow air toward the plurality of fins 10.

  The centrifugal pump 6 is a type of pump called a can pump (canned motor pump). As shown in FIG. 4, the centrifugal pump 6 includes a motor 15, an impeller 16 that rotates by the power of the motor 15, and a circuit board 17 for controlling the motor 15. The motor 15 is a DC brushless motor. The motor 15 includes a rotor 19 and a stator 20. The motor 15 of this embodiment is an outer rotor type motor. The impeller 16 is accommodated in the pump case 21. The pump case 21 includes a motor case 22 that constitutes a part of the motor 15 and a case body 23 that is fixed to the right end side of the motor case 22.

  The case body 23 is formed with a cooling medium suction port 23a and a cooling medium discharge port 23b. Inside the pump case 21 is formed a pump chamber 24 through which the cooling medium sucked from the suction port 23a passes toward the discharge port 23b. That is, a pump chamber 24 is formed in the centrifugal pump 6. An annular seal member 25 for securing the sealing property of the pump chamber 24 is disposed at a joint portion between the motor case 22 and the case body 23. The seal member 25 is an O-ring. The motor case 22 and the case body 23 are fixed to each other by screws.

  The rotor 19 includes a driving magnet 28 formed in a cylindrical shape and a cylindrical magnet holding member 29 to which the driving magnet 28 is fixed. The driving magnet 28 is fixed to the inner peripheral surface of the magnet holding member 29. N poles and S poles are alternately magnetized in the circumferential direction on the inner peripheral surface of the drive magnet 28. The cylindrical magnet holding member 29 is arranged so that the axial direction of the magnet holding member 29 coincides with the left-right direction. The impeller 16 is fixed to the right end of the magnet holding member 29. That is, the impeller 16 is fixed to the rotor 19. The impeller 16 and the rotor 19 are disposed inside the pump chamber 24.

  The impeller 16 and the rotor 19 are rotatably supported on the fixed shaft 30. That is, the motor 15 includes a fixed shaft 30 that rotatably supports the impeller 16 and the rotor 19. The impeller 16 and the rotor 19 rotate around the fixed shaft 30 as the center of rotation. The fixed shaft 30 of this embodiment is a rotation center axis that is the rotation center of the impeller 16 and the rotor 19. The fixed shaft 30 is arranged so that the axial direction of the fixed shaft 30 and the left-right direction coincide. That is, the left-right direction (X direction) is the axial direction of the fixed shaft 30. Further, the right direction (X1 direction) of the present embodiment is a first direction that is one of the axial directions of the fixed shaft 30, and the left direction (X2 direction) is a second direction that is opposite to the first direction. It has become.

  The impeller 16 is formed with a bearing portion 16a through which the fixed shaft 30 is inserted. The bearing portion 16a is formed in a cylindrical shape, and the fixed shaft 30 is inserted through the inner peripheral side of the bearing portion 16a. The right end portion of the fixed shaft 30 is held by the case body 23, and the left end portion of the fixed shaft 30 is held by the motor case 22. A thrust bearing 31 is disposed between the case body 23 and the bearing portion 16a, and a thrust bearing 32 is disposed between the motor case 22 and the bearing portion 16a. The thrust bearings 31 and 32 are sliding bearings formed in a flat plate shape.

  The impeller 16 is formed with a blade forming portion 16b in which a plurality of blades are formed. The blade forming portion 16b is connected to the right end of the bearing portion 16a. Further, the blade forming portion 16b extends outward in the radial direction from the right end of the bearing portion 16a. At the right end of the magnet holding member 29, the outer peripheral side portion of the blade forming portion 16b is fixed.

  The stator 20 is disposed on the inner peripheral side of the drive magnet 28. The stator 20 includes a plurality of driving coils 34 and a stator core 35. The driving coil 34 is wound around the salient pole portion of the stator core 35 via an insulator 36 formed of an insulating material such as resin. The driving coil 34 is electrically connected to the circuit board 17. The circuit board 17 and the stator core 35 are fixed to the motor case 22. The circuit board 17 and the stator 20 are covered with potting resin.

  The motor case 22 includes a partition wall 22 a disposed between the pump chamber 24 and the stator 20 so as to separate the pump chamber 24 and the stator 20, and a shaft holding portion 22 b that holds the left end portion of the fixed shaft 30. Yes. The partition wall 22 a functions to prevent the cooling medium in the pump chamber 24 from flowing into the locations where the stator 20 and the circuit board 17 are disposed. The shaft holding portion 22b is disposed at the center in the radial direction of the motor 15, and is connected to the partition wall 22a. An insertion hole 22c into which the left end portion of the fixed shaft 30 is inserted and a concave portion 22d in which the thrust bearing 32 is held are formed on the right end surface of the shaft holding portion 22b. The thrust bearing 32 is disposed between the bearing portion 16a of the impeller 16 and the shaft holding portion 22b in the left-right direction.

  The case body 23 is formed in a cylindrical shape with a bottom having a cylindrical portion 23c formed in a cylindrical shape and a bottom portion 23d that closes one end of the cylindrical portion 23c. The axial direction of the cylindrical portion 23c formed in a cylindrical shape coincides with the left-right direction. That is, the axial direction of the cylindrical portion 23 c matches the axial direction of the fixed shaft 30. The bottom portion 23d closes the right end of the cylindrical portion 23c. The thickness of the bottom 23d (thickness in the left-right direction) is relatively thin. A pump chamber 24 is provided on the inner peripheral side of the cylindrical portion 23c and the left side of the bottom portion 23d. The case body 23 has a shaft holding portion 23e for holding the right end portion of the fixed shaft 30, a cylindrical suction port forming portion 23f having a suction port 23a formed at the tip, and a cylinder having a discharge port 23b formed at the tip. A discharge port forming portion 23g is formed.

  The discharge port forming part 23g protrudes from the outer peripheral surface of the cylindrical part 23c toward the outer peripheral side. The suction port forming portion 23f protrudes from the center of the bottom portion 23d to the right side. The axis of the suction port forming portion 23 f formed in a cylindrical shape coincides with the axis of the fixed shaft 30. At the center of the bottom 23d, a through hole 23h that penetrates the bottom 23d in the left-right direction is formed. The through hole 23h is formed in a round hole shape. The axial center of the through hole 23h coincides with the axial center of the suction port forming portion 23f. The inner diameter of the through hole 23h is the same as the inner diameter of the suction port forming portion 23f. The cooling medium sucked from the suction port 23a passes through the inner peripheral side of the suction port forming part 23f and the through hole 23h.

  The shaft holding portion 23 e is disposed at the center in the radial direction of the motor 15. The shaft holding portion 23e is disposed on the left side of the bottom portion 23d. The shaft holding part 23e is connected to the center part of the bottom part 23d. Specifically, the shaft holding portion 23e is connected to the center portion of the bottom portion 23d through three connecting portions 23j. An insertion hole 23k into which the right end portion of the fixed shaft 30 is inserted and a concave portion 23n in which the thrust bearing 31 is held are formed on the left end surface of the shaft holding portion 23e. The thrust bearing 31 is disposed between the bearing portion 16a of the impeller 16 and the shaft holding portion 23e in the left-right direction. A gap (thrust backlash) is formed between at least one of the thrust bearing 31 and the bearing portion 16a and between the thrust bearing 32 and the bearing portion 16a.

  The connecting portion 23j rises from the left surface of the bottom portion 23d toward the left side. The shaft holding portion 23e is connected to the left end portions of the three connecting portions 23j. The three connecting portions 23j are arranged so as to surround the through hole 23h. The three connecting portions 23j are arranged at a constant pitch in the circumferential direction of the fixed shaft 30. The cooling medium flowing into the pump chamber 24 passes between the connecting portions 23 j in the circumferential direction of the fixed shaft 30.

  Two annular step surfaces 23p and 23q facing the left side are formed on the inner peripheral side of the cylindrical portion 23c. The right end surface of the motor case 22 is in contact with the step surface 23p. Moreover, the sealing member 25 is arrange | positioned using the level | step difference surface 23q. The shape of the inner peripheral surface 23r of the cylindrical portion 23c formed on the right side of the step surface 23p is a circular shape when viewed from the left-right direction. The inner peripheral surface of the cylindrical portion 23c formed between the step surface 23p and the step surface 23q and the inner peripheral surface of the cylindrical portion 23c formed on the left side of the step surface 23q are viewed from the left-right direction. The shape of the time is also circular.

  At the boundary between the left surface of the bottom portion 23d and the inner peripheral surface 23r of the cylindrical portion 23c, a concave curved surface (specifically, the left surface of the bottom portion 23d and the cylindrical portion connecting the left surface of the bottom portion 23d and the inner peripheral surface 23r of the cylindrical portion 23c). A curved surface portion 23s made of a concave curved surface that smoothly connects the inner peripheral surface 23r of 23c is formed. That is, the inner peripheral surface 23r is connected to the left surface of the bottom portion 23d through the curved surface portion 23s.

  The centrifugal pump 6 is fixed to one end of the radiator 4 in the longitudinal direction of the radiator 4. Specifically, the centrifugal pump 6 is fixed to the left end surface of the radiator 4. That is, the centrifugal pump 6 is fixed to the tank chamber 11. The centrifugal pump 6 is fixed to the tank chamber 11 with the bottom surface 23t, which is the right surface of the bottom 23d of the case body 23, facing the left side surface (left side surface) 11a of the tank chamber 11. The centrifugal pump 6 is fixed to the tank chamber 11 with screws.

  A suction port 23 a of the centrifugal pump 6 is connected to the tank chamber 11. That is, the suction side of the centrifugal pump 6 communicates with the inside of the tank chamber 11. As shown in FIG. 4, the side surface 11a is formed with a through hole 11b into which the suction port forming portion 23f is inserted. The discharge port 23b of the centrifugal pump 6 is connected to one of the two cooling bodies 3 via a pipe 37 made of a resin tube or the like. The other cooling body 3 of the two cooling bodies 3 is connected to the tank chamber 12 via a pipe 40 made of a resin tube or the like.

  In the centrifugal pump 6, as shown in FIG. 3, the outlet 24a of the cooling medium in the pump chamber 24 is disposed above the suction port 23a. In this embodiment, when the centrifugal pump 6 is driven, as shown by the arrow in FIG. 1, the cooling medium flows in the counterclockwise direction in FIG. 1, and the cooling medium circulates between the cooling body 3 and the radiator 4. .

  As shown in FIG. 4, an annular seal for preventing leakage of the cooling medium from between the centrifugal pump 6 and the tank chamber 11 is provided between the bottom surface 23 t of the case body 23 and the side surface 11 a of the tank chamber 11. A member 38 is arranged. The seal member 38 is an O-ring. Therefore, in the following description, the seal member 38 is referred to as an “O-ring 38”. The O-ring 38 is disposed on the outer peripheral side of the bottom surface 23t so as to surround the through hole 23h and the suction port forming portion 23f. The O-ring 38 disposed between the bottom surface 23t and the side surface 11a of the case body 23 has an annular shape, and the axis of the O-ring 38 substantially coincides with the axis of the suction port forming portion 23f. ing. The outer peripheral end portion of the side surface 11 a is an annular convex portion 11 c for positioning the O-ring 38. The convex part 11c protrudes toward the left side.

  When viewed from the left-right direction, the inner peripheral surface 23r of the cylindrical portion 23c and the O-ring 38 overlap each other. In this embodiment, when viewed from the left-right direction, the contact portion CP where the bottom surface 23t and the O-ring 38 are in contact is more radially outward of the cylindrical portion 23c than the inner end of the curved surface portion 23s in the radial direction of the cylindrical portion 23c. Is arranged. Specifically, in this embodiment, the contact portion CP overlaps the inner peripheral surface 23r when viewed from the left-right direction. In addition, the shape of the contact part CP when viewed from the left-right direction is substantially annular.

  An adhesive 39 for preventing leakage of the cooling medium from between the centrifugal pump 6 and the tank chamber 11 is applied between the bottom surface 23 t and the side surface 11 a on the inner peripheral side of the seal member 38. The adhesive 39 is applied over the entire circumference of the O-ring 38 on the inner circumference side of the O-ring 38. The adhesive 39 is applied between the outer peripheral surface of the suction port forming portion 23 f and the inner peripheral surface of the O-ring 38.

(Main effects of this form)
As described above, in this embodiment, the inner peripheral surface 23r of the cylindrical portion 23c of the case body 23 and the O-ring 38 overlap each other when viewed from the left-right direction. Therefore, in this embodiment, at least a part of the reaction force of the O-ring 38 that is crushed between the bottom 23d of the case body 23 and the tank chamber 11 can be received by the cylindrical portion 23c. Therefore, in this embodiment, even if the O-ring 38 is disposed between the bottom surface 23t of the case body 23 and the side surface 11a of the tank chamber 11, the left side of the bottom 23d of the case body 23 that is relatively thin is provided. It is possible to suppress deformation in the direction.

  In particular, in this embodiment, when viewed from the left-right direction, the contact portion CP where the bottom surface 23t and the O-ring 38 come into contact is more in the radial direction of the cylindrical portion 23c than the inner end of the curved surface portion 23s in the radial direction of the cylindrical portion 23c. Arranged outside. Specifically, when viewed from the left-right direction, the contact portion CP overlaps the inner peripheral surface 23r. Therefore, in this embodiment, it becomes possible to receive more reaction force of the O-ring 38 that is crushed between the bottom 23d of the case body 23 and the tank chamber 11 with the cylindrical portion 23c. Therefore, in this embodiment, it is possible to effectively suppress the leftward deformation of the bottom 23d having a relatively small thickness.

  Further, in this embodiment, since it is possible to suppress the deformation of the bottom 23d in the left direction, it is possible to suppress the amount of shift in the left direction of the shaft holding portion 23e connected to the center of the bottom 23d. . Therefore, in this embodiment, even if the O-ring 38 is disposed between the bottom surface 23t of the case body 23 and the side surface 11a of the tank chamber 11, the thrust bearing 31 and the bearing portion 16a held by the shaft holding portion 23e. It is possible to suppress the amount of reduction in the thrust backlash of the rotor 19 and the impeller 16 formed at least between the thrust bearing 32 held by the shaft holding portion 22b and the bearing portion 16a. As a result, the phenomenon that the rotor 19 and the impeller 16 do not rotate is less likely to occur.

  Further, in this embodiment, since the thickness of the bottom 23d can be made relatively thin while suppressing deformation of the bottom 23d, the centrifugal pump 6 can be downsized in the left-right direction. Therefore, in this embodiment, it is possible to suppress the protruding amount of the centrifugal pump 6 from the side surface of the radiator 4.

  In this embodiment, an adhesive 39 for preventing leakage of the cooling medium from between the centrifugal pump 6 and the tank chamber 11 is applied between the bottom surface 23t and the side surface 11a on the inner peripheral side of the seal member 38. Has been. For this reason, in this embodiment, it is possible to effectively prevent leakage of the cooling medium from between the centrifugal pump 6 and the tank chamber 11.

  In this embodiment, the cooling medium outlet 24a of the pump chamber 24 is disposed above the suction port 23a. Therefore, in this embodiment, when the centrifugal pump 6 is started, the air in the pump chamber 24 can be easily discharged to the outside of the pump chamber 24. That is, when the centrifugal pump 6 is stopped, the air in the pump chamber 24 accumulates in the upper portion of the pump chamber 24, and therefore the cooling medium outlet 24a of the pump chamber 24 is disposed above the suction port 23a. Then, when the centrifugal pump 6 is started, the air in the pump chamber 24 is easily discharged to the outside of the pump chamber 24. Therefore, in this embodiment, it becomes easy to surely remove the air in the pump chamber 24 by repeatedly starting and stopping the centrifugal pump 6.

(Other embodiments)
The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited to this, and various modifications can be made without departing from the scope of the present invention.

  In the embodiment described above, as shown in FIG. 6, one end side of a pipe 43 such as a resin tube disposed inside the tank chamber 11 is connected to the suction port forming portion 23 f of the centrifugal pump 6. The end may be disposed on the lower end side inside the tank chamber 11. In this case, even if there is air in the upper part of the tank chamber 11, the centrifugal pump 6 can be prevented from sucking the air in the tank chamber 11. In FIG. 6, the O-ring 38, the adhesive 39, and the like are not shown.

  In the embodiment described above, when viewed from the left-right direction, the contact portion CP may overlap the inner end of the curved surface portion 23s in the radial direction of the cylindrical portion 23c, or the curved portion 23s in the radial direction of the cylindrical portion 23c. You may arrange | position inside the radial direction of the cylinder part 23c rather than an inner side end. Further, in the above-described embodiment, when viewed from the left-right direction, the contact portion CP is located outside the inner end of the curved surface portion 23s in the radial direction of the cylindrical portion 23c and outside in the radial direction of the cylindrical portion 23c. You may arrange | position inside the radial direction of the cylinder part 23c rather than the surrounding surface 23r.

  In the embodiment described above, when viewed from the left-right direction, the contact portion CP may be disposed outside the inner peripheral surface 23r of the cylindrical portion 23c in the radial direction of the cylindrical portion 23c. In this case, all of the reaction force of the O-ring 38 that is crushed between the bottom surface 23t of the case body 23 and the side surface 11a of the tank chamber 11 can be received by the cylindrical portion 23c. Therefore, the deformation of the bottom 23d can be more effectively suppressed.

  In the embodiment described above, the seal member 38 may be an annular seal member other than the O-ring. Further, in the above-described form, the adhesive 39 may not be applied between the bottom surface 23t and the side surface 11a on the inner peripheral side of the seal member 38. In the embodiment described above, the motor 15 may include a rotating shaft to which the impeller 16 is fixed instead of the fixed shaft 30. The rotation axis in this case is a rotation center axis that is the rotation center of the impeller 16 and the rotor 19.

  In the embodiment described above, the cooling medium outlet 24a of the pump chamber 24 may be disposed at the same height as the suction port 23a or may be disposed below the suction port 23a. Further, in the embodiment described above, the two cooling bodies 3 may be connected in parallel to the radiator 4. Furthermore, in the form mentioned above, the number of the cooling bodies 3 with which the cooling device 1 is provided may be one, and may be three or more. Moreover, in the form mentioned above, the longitudinal direction of the radiator 4 may be inclined with respect to the horizontal direction. In the above-described embodiment, the heat generating component 2 may be a component other than an electronic component.

DESCRIPTION OF SYMBOLS 1 Cooling device 2 Heating component 3 Cooling body 4 Radiator 6 Centrifugal pump 9 Cooling pipe 10 Fin 11 Tank chamber 11a Side surface (side surface of tank chamber in second direction side)
DESCRIPTION OF SYMBOLS 15 Motor 16 Impeller 16a Bearing part 19 Rotor 20 Stator 23 Case body 23a Suction port 23b Discharge port 23c Cylindrical part 23d Bottom part 23e Shaft holding part 23f Suction port formation part 23h Through-hole 23r Inner peripheral surface 23s Curved surface part 23t Bottom surface 24t Pump chamber 24a Cooling medium outlet 30 Fixed shaft (rotation center shaft)
31 Thrust bearing 38 O-ring (seal member)
39 Adhesive 43 Piping CP Contact X X Axial direction of rotation center axis X1 First direction X2 Second direction

Claims (9)

A cooling body attached to the heat generating component and through which a cooling medium that is a cooling liquid passes, a radiator for cooling the cooling medium heated by the cooling body, and between the cooling body and the radiator And a centrifugal pump for circulating the cooling medium in
The radiator includes a plurality of cooling pipes through which the cooling medium passes, a plurality of heat radiation fins connected to the outer peripheral surface of the cooling pipe, and a tank chamber to which ends of the plurality of cooling pipes are connected.
The centrifugal pump includes a motor having a rotor and a stator, an impeller fixed to the rotor and rotated by power of the motor, and a case body in which a suction port and a discharge port for the cooling medium are formed.
The motor includes a rotation center shaft serving as a rotation center of the rotor and the impeller,
When one of the axial directions of the rotation center axis is the first direction and the opposite direction of the first direction is the second direction,
The case body is formed in a cylindrical shape with a bottom having a cylindrical portion formed in a cylindrical shape and a bottom portion that closes one end of the cylindrical portion,
The axial direction of the cylindrical portion formed in a cylindrical shape coincides with the axial direction of the rotation center axis,
The bottom portion closes a first direction end of the cylindrical portion,
The case body is formed with a shaft holding portion that holds an end portion of the rotation center shaft in the first direction,
In the center of the bottom portion, a through hole is formed through the bottom portion in the axial direction of the rotation center axis and through which the cooling medium sucked from the suction port passes.
The shaft holding portion is arranged on the second direction side of the bottom portion and is connected to the center portion of the bottom portion,
The centrifugal pump is fixed to the tank chamber with a bottom surface, which is a surface on the first direction side of the bottom portion, facing a side surface on the second direction side of the tank chamber,
An annular seal member for preventing leakage of the cooling medium from between the centrifugal pump and the tank chamber surrounds the through hole between the bottom surface of the bottom and the side surface of the tank chamber. Arranged as
When viewed from the axial direction of the rotation center shaft, the cooling device is characterized in that an inner peripheral surface of the cylindrical portion connected to a surface on the second direction side of the bottom portion overlaps with the seal member. The rotation center shaft is a fixed shaft that rotatably supports the rotor and the impeller,
The impeller is formed with a bearing portion through which the rotation center shaft is inserted,
The cooling device according to claim 1, wherein a thrust bearing is disposed between the bearing portion and the shaft holding portion in the axial direction of the rotation center shaft.   The cooling device according to claim 1, wherein the seal member is an O-ring. A curved surface formed of a concave curved surface connecting the second direction side surface of the bottom portion and the inner peripheral surface of the cylindrical portion at the boundary between the second direction side surface of the bottom portion and the inner peripheral surface of the cylindrical portion. Part is formed,
When viewed from the axial direction of the rotation center axis, the contact portion where the bottom surface of the bottom portion and the O-ring contact each other has a diameter of the cylindrical portion that is larger than the inner end of the curved portion in the radial direction of the cylindrical portion The cooling device according to claim 3, wherein the cooling device is disposed outside the direction.   The contact portion where the bottom surface of the bottom portion and the O-ring come into contact with the inner peripheral surface of the cylindrical portion when viewed from the axial direction of the rotation center axis overlaps the inner peripheral surface of the cylindrical portion. The cooling device according to 3 or 4.   When viewed from the axial direction of the rotation center axis, the contact portion where the bottom surface of the bottom portion and the O-ring are in contact is arranged outside the inner peripheral surface of the cylindrical portion in the radial direction of the cylindrical portion. The cooling device according to claim 3 or 4, wherein the cooling device is provided.   Adhesion for preventing leakage of the cooling medium from between the centrifugal pump and the tank chamber between the bottom surface of the bottom and the side surface of the tank chamber on the inner peripheral side of the seal member The cooling device according to claim 1, wherein an agent is applied. The radiator is formed in an elongated rectangular parallelepiped, and is arranged so that the longitudinal direction of the radiator coincides with the horizontal direction.
The tank chamber constitutes one end of the radiator in the longitudinal direction of the radiator,
The centrifugal pump is fixed to one end of the radiator in the longitudinal direction of the radiator,
The centrifugal pump is formed with a pump chamber through which the cooling medium sucked from the suction port passes toward the discharge port,
The cooling device according to any one of claims 1 to 7, wherein an outlet of the cooling medium in the pump chamber is disposed above the suction port. The radiator is formed in an elongated rectangular parallelepiped, and is arranged so that the longitudinal direction of the radiator coincides with the horizontal direction.
The tank chamber constitutes one end of the radiator in the longitudinal direction of the radiator,
The centrifugal pump is fixed to one end of the radiator in the longitudinal direction of the radiator,
One end side of a pipe disposed inside the tank chamber is connected to the suction port forming portion where the suction port is formed of the centrifugal pump,
The cooling apparatus according to claim 1, wherein the other end of the pipe is disposed on a lower end side inside the tank chamber.

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